Skateboard shelf



FIG. 1 is a front perspective view of a skateboard shelf in accordance with the new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a left side view thereof; and,

FIG. 7 is a right side view thereof.

The broken-line disclosure in the views is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for skateboard shelf, as shown and described. 